Fix Github Workflow

[georgysavva]

This PR updated the golangci-lint configuration and its GitHub workflow action. It also updates all other GitHub actions to the newest version.

[codecov]

Codecov Report

Merging #95 (e885490) into master (fe4b088) will decrease coverage by 4.32%.
The diff coverage is 67.36%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
- Coverage   87.13%   82.81%   -4.33%     
==========================================
  Files           5        5              
  Lines         342      512     +170     
==========================================
+ Hits          298      424     +126     
- Misses         33       73      +40     
- Partials       11       15       +4     

Flag	Coverage Δ
unittests	82.81% <67.36%> (-4.33%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pgxscan/pgxscan.go	70.73% <50.00%> (-10.04%)	⬇️
sqlscan/sqlscan.go	64.70% <58.33%> (-12.04%)	⬇️
dbscan/dbscan.go	79.41% <63.63%> (-2.49%)	⬇️
dbscan/rowscanner.go	95.83% <96.00%> (-0.60%)	⬇️
dbscan/structref.go	100.00% <0.00%> (ø)

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